Windows
ASPRunner.NET Single Developer Edition
ASPRunner.NET installs into the C:\Users\<username>\AppData\Local\ASPRunner.NET11 directory. Many find it beneficial to modify ASPRunner.NET files to add new languages, custom themes, plugins etc. However each ASPRunner.NET update completely erases added or modified files and replaces them with standard ones. To make your modifications persistent save them to C:\Users\<username>\AppData\Roaming\asprunnernet\resources directory instead
Custom themes
https://asprunner.com/forums/topic/26144-modifyingcreating-a-new-bootstrap-theme/
You can find existing standard themes in this directory
C:\Users\<username>\AppData\Local\ASPRunnerNET11\app-11.x.x\resources\styles\less\bootswatch
However when creating your own theme, save it to
C:\Users\<username>\AppData\Roaming\asprunnernet\resources\styles\less\bootswatch
Multilanguage messages
Standard language messages are stored in C:\Users\<username>\AppData\Local\ASPRunnerNET11\app-11.x.x\resources\lang folder. If you need to modify any of the files, first copy them to C:\Users\<username>\AppData\Roaming\asprunnernet\resources\lang and edit them there. Add new files also to that directory.
Rich text editor plugins
https://xlinesoft.com/phprunner/docs/rich_text_editor_plugins.htm
Unzip downloaded RTE editor plugins to
C:\Users\<username>\AppData\Roaming\asprunnernet\resources\source\plugins
Modified source C#/VB.NET and other files
If you need to change the code of a source .php file, say menu.php, the best way to do this is to add the original menu.php file to the Custom Files folder on the Style Screen in ASPRunner.NET, then edit it there. This way you'll have the modified menu.php file in your built application. However, if you want to apply the modification to all your projects, then copy the original menu.php to C:\Users\<username>\AppData\Roaming\asprunnernet\resources\source and change it there.
If you need to modify files from a subdirectory, then create the required subdirectories in C:\Users\<username>\AppData\Roaming\asprunnernet\resources\source and copy your files there.
ASPRunner.NET MultiDeveloper Edition
The directory where the app is installed is
C:\Users\<username>\AppData\Local\ASPRunnerNET11MultiDev
The directory where new and modified files should be placed:
C:\Users\<username>\AppData\Roaming\asprunnernetMultiDev\resources